CN220704780U - Rigidity-variable steel structure node - Google Patents

Abstract

The utility model discloses a variable-rigidity steel structure node which is arranged between a concrete buttress and a steel member. The utility model has the advantages that: the device is used in a steel structure to realize the rotation of a steel structure node, the rotation rigidity of the node is variable through different combinations of the disc springs, and when the rigidity of the disc spring group is extremely low, the node can be considered to be in a hinged state; the arrangement of the guide side wall can further control the unidirectional rotation or the bidirectional rotation of the node.

Description

A variable stiffness steel structure node

Technical field

The utility model relates to the technical field of steel structures, in particular to a variable-rigidity steel structure node.

Background technique

In steel structures, there are usually three types of connections between steel structures and concrete piers, namely flexible connections (also called joints), rigid connections and variable stiffness connections. Among them, rigid connection means that it does not rotate at all, and flexible connection (hinge) means that it can rotate freely. The variable stiffness connection is a connection form between flexible connection and rigid connection.

Compared with the flexible-connected hinged bearing, the variable-stiffness bearing will have a greater force on the bearing; compared with the rigidly-connected consolidated bearing, the bearing force will be smaller, somewhere in between.

Therefore, how to realize variable stiffness of the support is an urgent need for those skilled in the art.

Contents of the invention

The purpose of the utility model is to provide a variable stiffness steel structure node based on the above-mentioned deficiencies of the prior art. The variable stiffness steel structure node realizes variable node rotation stiffness by adopting different combinations of disc springs, and controls the node to rotate unidirectionally or bidirectionally by setting a guide side wall.

The purpose of this utility model is achieved by the following technical solutions:

A variable stiffness steel structure node is arranged between a concrete pier and a steel member, characterized in that the variable stiffness steel structure node includes an embedded part, a spacer, a bolt and a disc spring group, the embedded part is arranged on the top surface of the concrete pier, the spacer is arranged between the embedded part and the steel member, the screw head end of the bolt is embedded in the concrete pier, the connecting end of the screw protrudes from the embedded part and extends into the steel member, and the disc spring group is assembled on the screw connecting end of the bolt and fastened by a nut.

Four reserved holes are opened on the embedded part for the screw rods of the bolts to pass through, and the number of the bolts corresponds to the number of the reserved holes.

Guide side walls are provided on both sides of the embedded part, the bottom edge of the guide side wall is welded to the embedded part, and the inner side wall surface of the guide side wall is close to the bottom of the steel member to form a Guide limit.

The disc spring group is composed of a plurality of disc springs, and the disc springs are combined in parallel or in series.

The advantages of this utility model are: it is used in steel structures to realize the rotation of steel structure nodes, and the node rotation stiffness is variable through different combinations of disc springs. When the disc spring group has extremely small stiffness, the nodes can be considered to be in a hinged state; The setting of the guide side wall further controls the one-way or two-way rotation of the node.

Description of drawings

FIG1 is a schematic diagram of a variable stiffness steel structure node in the utility model;

FIG2 is a schematic diagram of the utility model in which guide side walls are arranged on both sides of the embedded parts;

Figure 3 is a schematic diagram of the embedded part in the present utility model without guide side walls;

Figure 4 is a schematic diagram of the parallel connection of the disc spring group in the present utility model;

Figure 5 is a schematic diagram of the disc spring group in the present utility model in series connection.

Detailed ways

The features and other related features of the present utility model will be further described in detail through examples in conjunction with the accompanying drawings to facilitate the understanding of those skilled in the industry:

As shown in Figure 1-5, the marks in the figure are: concrete pier 1, steel member 2, bolt 3, spacer 4, guide side wall 5, embedded part 6, disc spring group 7, nut 8, reserved hole 9.

Embodiment: As shown in Figures 1-5, this embodiment specifically relates to a variable stiffness steel structure node. The variable stiffness steel structure node is provided between the concrete pier 1 and the steel member 2. The variable stiffness steel structure node includes Embedded parts 6, pads 4, bolts 3 and disc spring group 7. This variable stiffness steel structure node uses different combinations of disc springs to achieve variable node rotation stiffness, and controls the node's one-way rotation through the setting of guide side walls 5 Or rotate in both directions.

As shown in Figure 1-3, the embedded part 6 is a steel plate pre-embedded on the top surface of the concrete pier 1. There are four reserved holes 9 on the steel plate. The number of reserved holes 9 corresponds to the number of bolts. The number of settings is 3, and the reserved holes 9 are distributed in a rectangular array. According to the demand for one-way rotation or two-way rotation of variable stiffness steel structure nodes, as shown in Figure 2, guide side walls 5 are welded on both sides of the embedded part 6 to achieve one-way rotation, or as shown in Figure 3 The two side edges of the embedded part 6 are not welded to the guide side walls 5 to achieve bidirectional rotation. It should be noted that, as shown in Figure 2, the bottom of the steel member 2 and the guide side walls 5 on both sides are in contact with each other to form a guide.

As shown in Figure 1, the pad 4 is provided between the embedded part 6 and the steel component 2 to support the steel component 2 and enable it to rotate. The diameter of the pad 4 is selected to be smaller, as shown in Figure 2 or 3. As shown in the figure, the spacer block 4 is arranged on the embedded part 6 and is centrally arranged between the reserved holes 9 .

As shown in Figures 1, 4, and 5, the screw head end of the bolt 3 is embedded in the concrete pier 1, and the connecting end of the screw penetrates through the reserved hole 9 on the embedded part 6 and extends into the steel member 2. The disc spring group 7 is assembled on the screw connecting end of the bolt 3 and tightened through the nut 8 so that the disc spring group 7 is sandwiched between the nut 8 and the bottom surface of the steel member 2 . The disc spring group 7 can be in parallel form as shown in Figure 4, or in series form as shown in Figure 5. By changing the specifications of the single disc spring, the combination form of the disc spring, and the number of groups of disc springs, the rotational stiffness of the node is changed, thereby achieving variable node stiffness. The change of the rotational stiffness of the node with the rotation angle can be approximately considered as a linear change. At the same time, the rotation amount of the node depends on the deformation ability of the disc spring group 7. In actual engineering, in order to ensure the long-term effectiveness of the node, the node is required to The rotation angle cannot exceed 0.8 times the deformation capacity of the disc spring group 7.

When the bending moment value at the maximum rotation angle of a node is less than 0.1 times the bending moment value just connected to this node, it can be approximately regarded as a hinged joint. The stiffness formula of disc spring group 7 is as follows, where K is the stiffness of a single disc spring, N is the number of parallel disc springs, and M is the number of series disc springs:

K _{parallel connection} =N·K

The theoretical formula of the rotational stiffness of the variable stiffness steel structure in this embodiment is:

Among them: L is the length of the embedded part 6, and K _{disc spring group} is the stiffness of the single-sided disc spring group, which can be obtained based on the series-parallel relationship of the disc spring group 7.

As shown in Figures 1-3, the design of the single/double variable stiffness node in this embodiment considers the following principles:

(1) Based on the actual requirements of the project, determine whether it is necessary to configure the guide side wall 5 to achieve one-way rotation.

(2) Under the expected most unfavorable working conditions, the rotation angle of the node does not exceed 0.8 times the deformation of the node disc spring group 7, and at the same time, each component in the node area maintains an elastic state.

(3) The design of each component in the node area shall refer to GB50017-2017 "Steel Structure Design Standard".

The beneficial effects of this embodiment are: used in steel structures to realize the rotation of steel structure nodes, and the node rotation stiffness can be variable through different combinations of disc springs. When the stiffness of the disc spring group is extremely small, the nodes can be considered to be in a hinged state; The one-way or two-way rotation of the node is controlled by the setting of the guide side wall.

Claims (4)

1. A variable stiffness steel structure node, which is disposed between concrete piers and steel members. It is characterized in that the variable stiffness steel structure node includes embedded parts, pads, bolts and disc spring groups. The embedded parts Located on the top surface of the concrete pier, the pad is arranged between the embedded part and the steel member, the head end of the screw of the bolt is embedded in the concrete pier, and the head end of the screw is embedded in the concrete pier. The connecting end protrudes from the embedded part and extends into the steel component. The screw connecting end of the bolt is equipped with the disc spring group and is tightened by a nut. 2. A variable stiffness steel structure node according to claim 1, characterized in that four reserved holes are opened on the embedded part for the screw rods of the bolts to pass through, and the number of the bolts corresponds to The number of reserved holes. 3. A variable stiffness steel structure node according to claim 1, characterized in that guide side walls are provided on both sides of the embedded part, and the bottom edge of the guide side wall is welded to the embedded part. , the inner side wall surface of the guide side wall abuts the bottom of the steel member to form a guide limiter. 4. A variable stiffness steel structure node according to claim 1, characterized in that the disc spring group is composed of a plurality of disc springs, and each of the disc springs is combined in parallel or in series.